402155557 has 8 divisors (see below), whose sum is σ = 416323800. Its totient is φ = 388007424.

The previous prime is 402155543. The next prime is 402155563. The reversal of 402155557 is 755551204.

It can be written as a sum of positive squares in 4 ways, for example, as 69239041 + 332916516 = 8321^2 + 18246^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402155557 - 2¹⁵ = 402122789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402155527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43869 + ... + 52237.

It is an arithmetic number, because the mean of its divisors is an integer number (52040475).

Almost surely, 2^402155557 is an apocalyptic number.

It is an amenable number.

402155557 is a deficient number, since it is larger than the sum of its proper divisors (14168243).

402155557 is a wasteful number, since it uses less digits than its factorization.

402155557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10055.

The product of its (nonzero) digits is 35000, while the sum is 34.

The square root of 402155557 is about 20053.8165195556. The cubic root of 402155557 is about 738.1274526928.

The spelling of 402155557 in words is "four hundred two million, one hundred fifty-five thousand, five hundred fifty-seven".